Re: [PATCH 0/3] arm64: cleanup DAIF handling for EL0 returns

[Itaru Kitayama <itaru.kitayama@linux.dev>]

On Tue, Feb 06, 2024 at 12:38:45PM +0000, Mark Rutland wrote:
> Hi,
> 
> These patches rework DAIF handling when returning to EL0, simplifiying
> the logic in do_notify_resume() and allowing Debug + SError to be
> unmasked for a little longer during exception return.
> 
> My primary motivation for these changes is to centralize entry/exit DAIF
> management within entry-common.c, as this will allow entry/exit
> sequences to be specialised, and make it much easier to add support for
> FEAT_NMI. With specialized entry DAIF management, it will also be
> possible to simplify local_daif_{save,restore}() and
> local_irq_{save,restore}().
> 
> I'm sending this out on its own as (IMO) it's a nice cleanup on its own,
> and I don't believe that I'll have the remainder of the DAIF rework
> ready for this cycle.
> 
> The series is based on v6.8-rc3.
> 
> Mark.
> 
> Mark Rutland (3):
>   arm64: Simplify do_notify_resume() DAIF masking
>   arm64: Move do_notify_resume() to entry-common.c
>   arm64: Unmask Debug + SError in do_notify_resume()
> 
>  arch/arm64/include/asm/exception.h |  2 +-
>  arch/arm64/kernel/entry-common.c   | 36 ++++++++++++++++++++++++++-
>  arch/arm64/kernel/signal.c         | 39 ++----------------------------
>  3 files changed, 38 insertions(+), 39 deletions(-)

Boot tested on RevC FVP and kselftest arm64 subcategory runs without an error
on RevC FVP too.

Itaru.

> 
> -- 
> 2.30.2
> 
> 
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